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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
CASH FLOWS FROM OPERATING ACTIVITIES:      
Net loss $ (115,204) $ (56,364) $ (166,227)
Adjustments to reconcile loss to net cash used in operating activities:      
Depreciation and amortization 166 198 246
Stock-based compensation 13,889 9,022 14,685
Excess tax (benefit from) provision on stock-based awards (727) 2,299 361
Amortization of debt discount and debt issuance costs 8,258 5,863 17,631
Amortization of intangible asset 646 646 646
Loss (gain) on changes in fair value of derivative liabilities 1,106 (13,472) (47,710)
Gain on extinguishment of debt (1,314) (38,034)  
Deferred income taxes (4,252) (3,614) (3,434)
Change in lease liability     6
Shares issued for services     27
Changes in assets and liabilities:      
Restricted cash   400 (1,000)
Accounts receivable (5,984) (4,197) (3,645)
Inventories (5,252) 12,958 (5,429)
Prepaid and other current assets (519) (1,053) 1,690
Other non-current assets 431 4,014 591
Accrued interest payable (652) 2,420 10,454
Deferred revenue 14,231 (1,703) 1,703
Accounts payable and other current liabilities 10,489 8,811 (7,228)
Other non-current liabilities (51)    
Net cash used in operating activities (84,748) (72,309) (190,336)
CASH FLOWS FROM INVESTING ACTIVITIES:      
Purchases of equipment (28)   (14)
Net cash used in investing activities (28)   (14)
CASH FLOWS FROM FINANCING ACTIVITIES:      
Proceeds from issuance of preferred stock, net of transaction costs 57,666    
Proceeds from issuance of common stock, net of transaction costs     121,206
Proceeds from issuance of convertible debt, net of transaction costs 27,514    
Proceeds from exercise of warrants, net of transaction costs 2,713 1,651 160
Proceeds from exercise of stock options, net of transaction costs 31 307 627
Refund of equity issuance costs   3,191  
Debt issuance costs (109) (2,480)  
Repurchase of convertible notes, including transaction costs (16,145)    
Excess tax benefit from (provision on) stock-based awards 727 (2,299) (361)
Acquisition of treasury stock (194)    
Payments under capital leases (5) (36) (10)
Net cash provided by financing activities 72,198 334 121,622
NET DECREASE IN CASH AND CASH EQUIVALENTS (12,578) (71,975) (68,728)
CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD 119,539 191,514 260,242
CASH AND CASH EQUIVALENTS, END OF PERIOD 106,961 119,539 191,514
Cash paid during the year for:      
Interest 12,559 10,033 6,090
Income taxes 711 781 1,395
Supplemental disclosure of non-cash items:      
Transfer of preferred stock purchase option derivative liability to equity 868    
Accretion of preferred stock beneficial conversion features 32,987    
Conversion of Series A Convertible Preferred Stock into common stock 4,804    
Reacquisition of conversion option in convertible notes 1,300 10,100  
Reclassification of warrant liability to additional paid-in capital     24
Warrant      
Adjustments to reconcile loss to net cash used in operating activities:      
Stock-based compensation $ (9) $ (503) $ (3,703)